statistics question

Project Description:

the following data gives the service times (in minutes) for a sample of 24 customers who arrived at the check-in service of an airline.

20
12
31
9
37
24
15
9
7
28
10
11
7
15
19
34
25
11
27
27
16
8
19
20
(a) construct a stem-and-leaf diagram using this data. ​
(b) the airline company believes that the service time is usually less than 20 minutes. using your answer in (a), comment on this statement (use 20 to 30 words).​
(c) recommend and draw the most suitable graph for this data. (use 30 to 50 words to answer this part)​
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